Redox reactions practice · Mixed difficulty

Which of the following cannot show variable oxidation state?

How many electrons are involved in oxidation of $\mathrm{KMn}{\mathrm{O}_4}$ in basic medium?

The oxidation number of ‘ P ’ in $M{g_2}{P_2}{O_7}^{^{}}$ is

In which of the following compounds iron has lowest oxidation number?

Which of the following is disproportionation reaction?

Assertion :- $\mathrm{Fe}^{3+}$ catalysts oxidation of $\mathrm{I}^{-}$ by $\mathrm{S}_2 \mathrm{O}_8^{2-}$

Reason :- $\mathrm{S}_2 \mathrm{O}_8^{2-}$ oxidize $\mathrm{Fe}^{2+}$ to $\mathrm{Fe}^{3+}$

What would happen when a small quantity of ${\mathrm{H}_2}{\mathrm{O}_2}$ is added to a solution of $\mathrm{FeS}{\mathrm{O}_4}$?

In which reaction change in oxidation number of underlined atom is maximum when all of them react with $C{l_2}$ water:-

Which of the following reactions leads to the breakdown of a compound into two or more components?

In Which of the following compounds the oxidation number of carbon is maximum:

Oxidation number of oxygen in ${O_2}{F_2}$ is

Assertion (A): Addition of water to a solution containing solute and solvent cannot change it's normality or molarity.

Reason (R): The milliequivalent and millimoles of the solute are changed on dilution.

$\mathrm{MnO}_4^ -$ is a good oxidising agent in different medium changing to $\mathrm{MnO}_4^ - \to \mathrm{M}{\mathrm{n}^{2 + }}$,$\to \mathrm{MnO}_4^{2 - }, \to \mathrm{Mn}{\mathrm{O}_2}, \to \mathrm{M}{\mathrm{n}_2}{\mathrm{O}_3}$ Changes in oxidation number respectively are

In $\mathrm{C} + {\mathrm{H}_2}\mathrm{O} \to \mathrm{CO} + {\mathrm{H}_2};{\mathrm{H}_2}\mathrm{O acts as}:$

The redox reaction among the following is

An element with electronic arrangement at 2, 8, 18, 1 will exhibit the following oxidation states

In the reaction, $\mathrm{C}{\mathrm{H}_3}\mathrm{OH} \to \mathrm{HCOOH}$, the number of electrons that must be added to the right is:

A group of methods of quantitative chemical analysis involving the measurement of volume of reacting substance is known as :

The oxidation number of sulphur in $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7$ and iron in $\mathrm{K}_4 \mathrm{Fe}(\mathrm{CN})_6$ is respectively:

Assertion (A): Oxygen has oxidation state of -2 in both $\mathrm{O}_2$ and $\mathrm{O}_3.$

Reason (R): Oxygen is assigned an oxidation state of -2 in almost all its compounds.

Among $\mathrm{N}{\mathrm{H}_3},\mathrm{HN}{\mathrm{O}_{3,}}\mathrm{Na}{\mathrm{N}_3}$ and $\mathrm{M}{\mathrm{g}_3}{\mathrm{N}_2};$ the number of molecules having nitrogen in negative oxidation state is

Assertion: In alkaline medium, $\mathrm{KMnO}_4$ acts as powerful oxidising agent.
Reason: $\mathrm{KMnO}_4$ reduces to give $\mathrm{Mn}^{2+}$ in alkaline medium.

Identify the disproportionation reaction :

Which of the following is not a redox reaction?

Which of the following is the cell reaction that occurs when the following half - cells are combined?

$\begin{aligned} & \mathrm{I}_2+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{I}^{-}(1\,\mathrm{M}) ; \mathrm{E}^{\circ}=+0.54 \mathrm{~V} \\ & \mathrm{Br}_2+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{Br}^{-}(1\,\mathrm{M}) ; \mathrm{E}^{\circ}=+1.09 \mathrm{~V} \end{aligned}$

The value of 'n' in the reaction $\mathrm{C}{\mathrm{r}_2}\mathrm{O}_7^{2 - } + 14{\mathrm{H}^ + } + n\mathrm{F}{\mathrm{e}^{2 + }} \to 2\mathrm{C}{\mathrm{r}^{3 + }} + n\mathrm{F}{\mathrm{e}^{3 + }} + 7{\mathrm{H}^2}\mathrm{O}$ will be

Starch iodide paper is used to test for the presence of:

In which case $+ 1$ oxidation state is stable than $+ 3$?

The halogen that most easily reduced is

It is found that V forms a double salt isomorphous with Mohr’s salt. The oxidation number of V in this compound is :